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CHAPTER 18 SERIAL INTERFACE CHANNEL 1
Figure 18-5. Automatic Data Transmit/Receive Interval Specify Register Format (4/4)
Note The data transfer interval includes an error. The data transfer minimum and maximum intervals
are found from the following expressions (n: Value set in ADTI0 to ADTI4). However, if a minimum
which is calculated by the following expressions is smaller than 2/fSCK, the minimum interval time
is 2/fSCK.
Minimum = (n+1) × ++
Maximum = (n+1) × ++
Cautions 1. Do not write data to ADTI during operation of automatic data transmit/receive
function.
2. Bits 5 and 6 must be set to zero.
3. To control the data transfer interval by means of automatic transmission/reception
with ADTI, busy control (refer to 18.4.3 (4) (a) Busy control option) is disabled.
Remarks 1. f
XX : Main system clock frequency (fX or fX/2)
2. fX : Main system clock oscillation frequency
3. f
SCK : Serial clock frequency
2
6
fXX
2
6
fXX
28
f
XX
36
f
XX
0.5
f
SCK
1.5
f
SCK
Data Transfer Interval Specification (f
XX
= 2.5 MHz Operation)
ADTI4 ADTI3 ADTI2 ADTI1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Minimum
Note
446.4
s + 0.5/f
SCK
472.0
s + 0.5/f
SCK
497.6
s + 0.5/f
SCK
523.2
s + 0.5/f
SCK
548.8
s + 0.5/f
SCK
574.4
s + 0.5/f
SCK
600.0
s + 0.5/f
SCK
625.6
s + 0.5/f
SCK
651.2
s + 0.5/f
SCK
676.8
s + 0.5/f
SCK
702.4
s + 0.5/f
SCK
728.0
s + 0.5/f
SCK
753.6
s + 0.5/f
SCK
779.2
s + 0.5/f
SCK
804.8
s + 0.5/f
SCK
830.4
s + 0.5/f
SCK
Maximum
Note
449.6
s + 1.5/f
SCK
475.2
s + 1.5/f
SCK
500.8
s + 1.5/f
SCK
526.4
s + 1.5/f
SCK
552.0
s + 1.5/f
SCK
577.6
s + 1.5/f
SCK
603.2
s + 1.5/f
SCK
628.8
s + 1.5/f
SCK
654.4
s + 1.5/f
SCK
680.0
s + 1.5/f
SCK
705.6
s + 1.5/f
SCK
731.2
s + 1.5/f
SCK
756.8
s + 1.5/f
SCK
782.4
s + 1.5/f
SCK
808.0
s + 1.5/f
SCK
833.6
s + 1.5/f
SCK
65432107
Symbol
ADTI ADTI7 0 0 ADTI4 ADTI3 ADTI2 ADTI1 ADTI0
FF6BH 00H R/W
Address After Reset R/W
ADTI0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ
µ